CN210002342U - Coating type plain soil cofferdam structure of kinds of dredging engineering - Google Patents
Coating type plain soil cofferdam structure of kinds of dredging engineering Download PDFInfo
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- CN210002342U CN210002342U CN201920493232.3U CN201920493232U CN210002342U CN 210002342 U CN210002342 U CN 210002342U CN 201920493232 U CN201920493232 U CN 201920493232U CN 210002342 U CN210002342 U CN 210002342U
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Abstract
The utility model relates to a kinds of dredging engineering's cladding type plain soil cofferdam structure, including the cofferdam body that adopts the plain soil of cofferdam to pile up on subaerial, the cross section is trapezoidal shape, subaerial at the root position of the cofferdam of cofferdam body side of meeting water, the trench has been seted up along the length direction of cofferdam body, still include the waterproof geotechnological cloth that becomes U type and lay in the cofferdam body, the straight section of waterproof geotechnological cloth lower part is located the position of cofferdam plain soil and ground juncture and geotechnological cloth lower limb extends into the trench, the straight section of waterproof geotechnological cloth upper portion extends and wears out to the cofferdam side of meeting water level and the domatic of geotechnological cloth upper limb along the side of meeting water of cofferdam is met, still include the plastic sheeting, its main part covers cofferdam side of meeting water and trench, the plastic sheeting extends to subaerial of trench inboard, the plastic sheeting extends to cofferdam body top, be equipped with ditch plain soil in the trench, still include a plurality of sandbags.
Description
Technical Field
The utility model belongs to the technical field of the dredging engineering, especially, relate to kinds of dredging engineering's cladding type plain soil cofferdam structure.
Background
At present, more and more ports start to enter a reconstruction and lifting stage successively, the port grade is lifted by widening the construction of deepened channels and the like, and the dredged soil is reclaimed to a reclamation area by a ship dredger fill mode, but under the influence of the national general strategy, the ocean management department still suspends the approval work of accepting sea procedures at present, so that the reclamation area can hardly be newly built under the condition of no sea area use procedures, and only the existing land area can be used for building the reclamation area.
According to the prior dredging and hydraulic reclamation engineering case, the cofferdam structure mainly comprises a filling bag structure type cofferdam and a plain soil structure type cofferdam, wherein the filling bag structure type cofferdam has higher reliability, so most of the engineering mainly adopts the filling bag structure type cofferdam. The filling bag structure type cofferdam has the characteristics of good integrity, good stability, high cost, high durability, more complex process, long construction period and the like, and the cofferdam needs more workers, electric equipment, a slurry pump, a hydraulic filling hose, a filling bag and the like in the construction process. The plain soil structure type cofferdam has the characteristics of poor stability, low cost, poor durability, simple process, short construction period and the like, and the cofferdam needs to be invested with more excavators, earth carriers and the like in the construction process.
On the basis of combining the actual conditions of the construction site and the opinions of construction units, a plain soil structural type cofferdam is adopted as a main cofferdam of the hydraulic reclamation area in part of the construction sites. In consideration of the characteristics of easy collapse, easy permeation and the like of the plain soil structural cofferdam, the adverse consequences that the actual section of the cofferdam is smaller than the designed section, the overall stability of the cofferdam is reduced and the like are easily caused, so that the cofferdam structure needs to be optimally designed while the safety and reliability of the cofferdam and the cost are considered on site, and the specific requirements of the current plain soil cofferdam structure are difficult to meet.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a solve the technical problem that exists among the well-known art and provide kinds of simple structure, difficult seepage and collapse's the plain soil cofferdam structure of cladding type of dredging engineering, the advantage that plain soil cofferdam of performance was easily built overcomes plain soil cofferdam poor stability's shortcoming simultaneously.
The utility model discloses a solve the technical problem that exists among the known art and adopt the technical scheme that kinds of dredging engineering's cladding type plain soil cofferdam structure includes that adopt the plain soil of cofferdam pile to become on ground, the cross section is trapezoidal shape's cofferdam body, subaerial, along the length direction of cofferdam body of the root position of the cofferdam side of meeting water of cofferdam body seted up the trench, still include the waterproof geotechnological cloth of U type laying in the cofferdam body, the straight section of waterproof geotechnological cloth lower part is located the position of cofferdam plain soil and ground juncture and geotechnological cloth lower limb extends into the trench, the straight section of waterproof geotechnological cloth upper portion extends to cofferdam side of meeting water level and wears out and geotechnological cloth upper edge along the domatic droop of cofferdam side of meeting water, still include the plastic sheeting, the main part of plastic sheeting covers cofferdam side of meeting water and trench, the plastic sheeting extends to the subaerial of trench inboard, the plastic sheeting extends to the cofferdam body top, be equipped with the plain soil of holding the fixed bag in the trench.
The utility model has the advantages and the positive effects that the utility model provides a simple reasonable dredging engineering's of structural design cladding type plain soil cofferdam structure, on the basis of current plain soil cofferdam structure, through the waterproof geotechnological cloth that increases the U-shaped arrangement in the cofferdam main part, has reduced the water yield through plain soil granule space outside leakage to the degree, whole plain soil cofferdam structure's stability has directly been promoted, through laying the plastic sheet in the side of meeting water, the cofferdam side of meeting water has been prevented effectively and has received the rivers erode, it has avoided the collapse of plain soil cofferdam to advance step, bury into the trench of the inboard bottom of plain soil cofferdam through the lower limb with the plastic sheet, effectively prevented that plain soil cofferdam side of meeting water plastic sheet from taking place to float under the effect of water buoyancy and can not exert the circumstances of waterproof effect and take place, press through setting up a plurality of sand bags and hold the plastic sheet, the float of plastic sheet and the circumstances that the plastic sheet slided to the bottom of cofferdam takes place the plain soil cofferdam structure possesses the traditional plain soil cofferdam structure of building, the cost of building is optimized simultaneously, the whole engineering of the improvement is satisfied a great deal with the earth strength, the earth-proof engineering, the whole earth-water-proof engineering, the earth-proof engineering has obtained the requirement of the whole engineering of the improvement, the advantage of the improvement of the construction.
Preferably: the sand bags are respectively pressed on the upper edge of the plastic cloth, the part of the cofferdam on the water facing side covered by the plastic cloth, the part of the plastic cloth overlapped with the lower edge of the geotextile and the lower edge of the plastic cloth.
Preferably: the sand bags on the upper edge of the plastic cloth, the part of the cofferdam covered by the plastic cloth on the water facing side and the overlapping part of the plastic cloth and the lower edge of the geotextile are connected in sequence by adopting the connecting ropes.
Preferably: the edge part of the upper edge of the plastic cloth is embedded into the top of the cofferdam body.
Preferably: the distance w between the part of the waterproof geotextile bent back in the cofferdam body and the central plane of the cofferdam body is less than or equal to 50cm, and the distance h between the straight section at the upper part and the straight section at the lower part of the waterproof geotextile is more than or equal to 40 percent of the total height of the cofferdam body.
Preferably: the cross section of the trench is in an inverted trapezoid shape, and the width of the top of the trench is equal to 0.05 to 0.1 time of the width of the bottom of the cofferdam body.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
In the figure: 1. the lower edge of the plastic cloth; 2. plain soil in the ditch; 3. a trench; 4. the lower edge of the geotextile; 5. plastic cloth; 6. the upper edge of the geotextile; 7. a sand bag; 8. connecting ropes; 9. the water facing side of the cofferdam; 10. the upper edge of the plastic cloth; 11. a cofferdam body; 12. the backwater side of the cofferdam; 13. waterproof geotextile; 14. cofferdam plain soil; 15. and (4) the ground.
Detailed Description
To further understand the contents, features and functions of the present invention, the following embodiments are described in detail:
referring to fig. 1, the coated type plain soil cofferdam structure of dredging engineering of the present invention comprises a cofferdam body 11 with a trapezoidal cross section, which is piled up by cofferdam plain soil 14 on the ground 15, and a trench 3 is opened on the ground 15 of the root position of the cofferdam facing side 9 of the cofferdam body 11 along the length direction of the cofferdam body 11. In the process of constructing the plain soil cofferdam, engineering machinery is required to be adopted to carry out layered compaction on the plain soil 14 of the cofferdam so as to fully reduce the gaps among soil particles.
The cofferdam body 11 is in a closed ring shape, a circled area is used for hydraulic fill construction, a water outlet is arranged at a specific position of the cofferdam body 11, water in the cofferdam is discharged through the water outlet after hydraulic fill construction, mud is settled to form a land, the cofferdam body 11 is obtained by piling and extruding cofferdam plain soil 14 by engineering machinery, the section is in a trapezoidal shape (isosceles trapezoid), the side with water, namely the inner side, forms the cofferdam water-facing side 9, the side without water, namely the outer side 12 of the cofferdam, and before the construction of the plain soil cofferdam, firstly, the construction site is subjected to stepping and topographic survey, weak parts of a low-lying part and a foundation are subjected to strengthening treatment (such as paving base stones at the low-lying part and the like) to ensure construction quality, strengthening structures (such as outer protecting slopes and the like) can be paved at the outer side of the cofferdam water-backing side 12, and the whole structural strength of the cofferdam is improved by .
Still include the waterproof geotechnological cloth 13 of laying in cofferdam body 11 one-tenth U type, the straight section of waterproof geotechnological cloth 13 lower part is located the position of cofferdam plain soil 14 and ground 15 juncture and geotechnological cloth lower limb 4 extends into trench 3, and the straight section on waterproof geotechnological cloth 13 upper portion is to cofferdam meeting water side 9 horizontal extension and wear out and geotechnological cloth upper limb 6 hangs down along the domatic of cofferdam meeting water side 9.
The waterproof geotextile 13 is a geotechnical impermeable material which is formed by compounding a plastic film serving as an impermeable base material and non-woven fabrics, can effectively intercept sand loss, discharges redundant liquid and gas in a soil body structure, enhances the stability of a building structure, improves the soil body quality, is a conventional material sold in the market, and is widely applied to dredging construction engineering.
At present, the plastic film for domestic and overseas anti-seepage application mainly comprises polyvinyl chloride (PVC) and Polyethylene (PE), which are kinds of high-molecular chemical flexible materials with small specific gravity, strong extensibility, high deformation adaptability, corrosion resistance, low temperature resistance and good frost resistance, and the main mechanism is that the water impermeability of the plastic film is used for separating a water leakage channel of an earth dam, and the non-woven fabric is kinds of high-molecular short fiber chemical materials which are formed by needling or hot bonding and have high tensile strength and extensibility, after being combined with the plastic film, the plastic film has increased tensile strength and puncture resistance, and the non-woven fabric has rough surface, increased friction coefficient of a contact surface, and is beneficial to the stability of a composite geomembrane and a protective layer.
Considering that the plain soil cofferdam is in a closed annular shape, the waterproof geotextile 13 is usually in a block shape, and the breadth size of the waterproof geotextile 13 cannot be too large, the plain soil cofferdam needs to adopt a plurality of waterproof geotextile 13 to be lapped one by one along the length direction, the lapping length between two adjacent geotextile 13 is more than or equal to 1.5 m, and thus the water can be prevented from seeping out between two adjacent geotextile 13 as much as possible.
In this embodiment, the distance w between the curved portion of the waterproof geotextile 13 in the cofferdam body 11 and the central plane of the cofferdam body 11 is less than or equal to 50cm, preferably 35cm, and the distance h between the straight section of the upper portion of the waterproof geotextile 13 and the straight section of the lower portion thereof is greater than or equal to 40%, preferably 55%, of the total height of the cofferdam body 11. The effect of this arrangement is to make the U-shaped waterproof geotextile 13 cover the main part of the middle lower part of the cofferdam body 11. In fact, after the cofferdam is built, the water level inside the cofferdam cannot reach the top of the cofferdam, so the position needing important protection is the middle lower part of the cofferdam body 11, and the waterproof geotextile 13 is arranged at the middle lower part of the cofferdam body 11 to prevent water leakage.
The cofferdam is characterized by further comprising a plastic cloth 5, the main part of the plastic cloth 5 covers the water facing side 9 of the cofferdam and the trench 3, the lower edge 1 of the plastic cloth extends to the ground 15 on the inner side of the trench 3, the upper edge 10 of the plastic cloth extends to the top of the cofferdam body 11, and trench plain soil 2 for pressing and fixing the plastic cloth 5 is arranged in the trench 3.
The trench 3 is excavated along the length direction of the cofferdam body 11 by using engineering machinery after the cofferdam body 11 is formed, in this embodiment, the cross-sectional shape of the trench 3 is an inverted trapezoid shape, and the width of the top is equal to 0.05 to 0.1 times, preferably 0.07 times, of the width of the bottom of the cofferdam body 11. Through set up plain soil 2 in the ditch in trench 3, fix the well lower part of plastic sheeting 5 reliably, prevent effectively that plastic sheeting 5 from wafting under the effect of factors such as external force erodees, buoyancy and moving away the position even, guaranteed the stability in plastic sheeting 5 position, just also guaranteed the structural strength of plain soil cofferdam.
In order to avoid displacement of the sheet 5 at step , the upper edge 10 of the sheet is securely fixed by embedding the edge portion of the upper edge 10 of the sheet in the top of the cofferdam body 11, i.e., digging a hole in the top of the cofferdam body 11, and embedding the edge portion of the upper edge 10 of the sheet in the trench and using cofferdam soil 14.
And a plurality of sandbags 7 for fixing the plastic cloth 5. As shown in the figure, a plurality of sand bags 7 are respectively pressed on the upper edge 10 of the plastic cloth, the part of the plastic cloth 5 covering the water facing side 9 of the cofferdam, the part of the plastic cloth 5 overlapping with the lower edge 4 of the geotextile and the lower edge 1 of the plastic cloth. Wherein, a plurality of sand bags 7 that are located on the plastic cloth upper edge 10, on the part of plastic cloth 5 cover cofferdam meeting the water side 9, on the plastic cloth 5 and geotechnical cloth lower limb 4 overlap portion adopt to connect rope 8 and connect in order, and sand bag 7 after the connection changes in the holding position, avoids appearing phenomenons such as landing, and the holding of sand bag 7 position is favorable to the holding of plastic cloth 5 position.
Considering that the plain soil cofferdam is in a closed annular shape, the plastic cloth 5 is usually in a block shape, and the breadth size of the plastic cloth 5 cannot be made too large, the plain soil cofferdam needs to be formed by overlapping a plurality of plastic cloths 5 piece by piece along the length direction, the overlapping length between two adjacent pieces is more than or equal to 1.5 meters, so that water can be prevented from seeping out between the two adjacent plastic cloths 5 as much as possible, the sand bags 7 are also arranged along the length direction of the cofferdam body 11, a plurality of groups of sand bags 7 on the same section position are groups, a plurality of groups are arranged along the length direction of the cofferdam body 11, and the distance between two adjacent groups of sand bags 7 is less than or equal to 2 meters, so that the pressing reliability of the plastic cloths 5 can be.
The construction process of the plain soil cofferdam comprises the following steps:
(1) performing reconnaissance and topographic survey on a construction site, and performing enhancement treatment on weak parts of a low-lying land and a foundation;
(2) marking and measuring the position of the cofferdam, and marking on the ground 15;
(3) laying waterproof geotextile 13 on the ground 15 along the marking position, then stacking cofferdam plain soil 14 on the waterproof geotextile 13 by using engineering machinery and compacting the geotextile in layers, pulling the waterproof geotextile 13 inwards to form a U-shaped shape, stacking the cofferdam plain soil 14 by using the engineering machinery from the other side, combining the cofferdam plain soil 14 on the waterproof geotextile 13 to form a cofferdam body 11, stacking the cofferdam plain soil 14 layer by layer above the cofferdam body and compacting the cofferdam body layer by layer until the complete cofferdam body 11 is formed, and forming platforms on the top of the cofferdam body 11 as shown in the figure, thus being beneficial to the construction of workers on the top;
(4) digging a trench 3 at the inner side, and then paving a plastic cloth 5 on the water facing side 9 of the cofferdam; the upper edge 10 of the plastic cloth 5 is embedded into the top of the cofferdam body 11, the main part of the plastic cloth 5 covers the water facing side 9 of the cofferdam and the trench 3, and the lower edge 1 of the plastic cloth extends to the ground 15 at the inner side of the trench 3;
(5) filling the trench 3 with trench plain soil 2, and pressing the middle lower part of the plastic cloth 5 tightly;
(6) placing a plurality of sand bags 7 on the surface of the plastic cloth 5, sequentially connecting the sand bags 7 by using a connecting rope 8, compacting the main part of the plastic cloth 5, and pressing the upper edge 10 of the plastic cloth and the lower edge 1 of the plastic cloth on the ground 15 at the inner side of the trench 3 at the top of the cofferdam body 11 by the sand bags 7;
(7) and forming a complete plain soil cofferdam, and then performing hydraulic reclamation construction.
Claims (6)
- The coating type plain soil cofferdam structure for the dredging engineering is characterized by comprising a cofferdam body (11) which is piled by adopting cofferdam plain soil (14) on the ground (15) and has a trapezoidal cross section, a trench (3) is formed in the length direction of the cofferdam body (11) on the ground (15) at the root position of a cofferdam water facing side (9) of the cofferdam body (11), waterproof geotextile (13) laid in the cofferdam body (11) in a U shape, a straight section at the lower part of the waterproof geotextile (13) is positioned at the junction position of the cofferdam plain soil (14) and the ground (15), the lower edge (4) of the geotextile extends into the trench (3), a straight section at the upper part of the waterproof geotextile (13) horizontally extends towards the cofferdam water facing side (9) and penetrates out, the upper edge (6) of the geotextile extends along the slope of the cofferdam water facing side (9), the plastic cloth (5) also comprises plastic cloth (5), the main part of the plastic cloth (5) covers the cofferdam water facing side (9), the upper edge (3) of the geotextile and the upper edge (5) extends to the top of the trench (3), and a plurality of plastic bags (5) are arranged in the plastic cloth (5) and fixed in the upper edge (5) of the cofferdam and fixed in the plastic cloth (5).
- 2. The dredging project cladding type plain soil cofferdam structure of claim 1, wherein: the sand bags (7) are respectively pressed on the upper edge (10) of the plastic cloth, the part of the plastic cloth (5) covering the water facing side (9) of the cofferdam, the part of the plastic cloth (5) overlapped with the lower edge (4) of the geotextile and the lower edge (1) of the plastic cloth.
- 3. The dredging project cladding type plain soil cofferdam structure of claim 2, wherein: the sand bags (7) which are positioned on the upper edge (10) of the plastic cloth, the part of the plastic cloth (5) covering the water facing side (9) of the cofferdam and the overlapped part of the plastic cloth (5) and the lower edge (4) of the geotextile are sequentially connected by adopting the connecting ropes (8).
- 4. The dredging project cladding type plain soil cofferdam structure of claim 3, wherein: the edge part of the upper edge (10) of the plastic cloth is buried in the top of the cofferdam body (11).
- 5. The dredging project cladding type plain soil cofferdam structure of claim 4, wherein: the distance w between the part of the waterproof geotextile (13) which is bent back in the cofferdam body (11) and the central plane of the cofferdam body (11) is less than or equal to 50cm, and the distance h between the straight section at the upper part and the straight section at the lower part of the waterproof geotextile (13) is more than or equal to 40 percent of the total height of the cofferdam body (11).
- 6. The dredging project cladding type plain soil cofferdam structure of claim 5, wherein: the cross section of the trench (3) is in an inverted trapezoid shape, and the width of the top of the trench is equal to 0.05 to 0.1 time of the width of the bottom of the cofferdam body (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920493232.3U CN210002342U (en) | 2019-04-12 | 2019-04-12 | Coating type plain soil cofferdam structure of kinds of dredging engineering |
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| CN201920493232.3U CN210002342U (en) | 2019-04-12 | 2019-04-12 | Coating type plain soil cofferdam structure of kinds of dredging engineering |
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| CN210002342U true CN210002342U (en) | 2020-01-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111996993A (en) * | 2020-08-13 | 2020-11-27 | 盐城工学院 | Method for forming impervious layer in cofferdam with sandy soil or silt as filler by utilizing straw degradation |
-
2019
- 2019-04-12 CN CN201920493232.3U patent/CN210002342U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111996993A (en) * | 2020-08-13 | 2020-11-27 | 盐城工学院 | Method for forming impervious layer in cofferdam with sandy soil or silt as filler by utilizing straw degradation |
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Address after: Room 346, Chentang technology incubator, 17 Yujiang Road, Hexi District, Tianjin, 300221 Patentee after: CCCC (Tianjin) Dredging Engineering Co.,Ltd. Address before: Tianhang building, No.1, Zhongxin Road, Tanggu District, Binhai New Area, Tianjin 300450 Patentee before: CCCC-TDC BINHAI ENVIRONMENTAL CHANNEL DREDGING Co.,Ltd. |
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